Integrate Simulink + GUI: Attempt to reference field of non-structure array.

Hello

My problem is: I wrote a code in Gui, for a startstop button. Since I run my gui, a Scope window opens with the results. It is all ok. Now, I want to plot the Scope results in a different figure to save it. To do that I use the following:

    (...)
    figure(1)
    plot(ScopeData.time, ScopeData.signals(1,2).values(:,1),ScopeData.time, ScopeData.signals(1,2).values(:,2));
    (...)

In fact, a new figure is open with the result. However, an error message appear too

"Attempt to reference field of non-structure array.

Error in METRE>pushbutton_startstop_Callback (line 182) plot(ScopeData.time, ScopeData.signals(1,2).values(:,1),ScopeData.time, ScopeData.signals(1,2).values(:,2));

Error in gui_mainfcn (line 96) feval(varargin{:});

Error in METRE (line 62) gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)METRE('pushbutton_startstop_Callback',hObject,eventdata,guidata(hObject))

Error using pause Error while evaluating uicontrol Callback "

Where is the problem? I have my figure with the plot. But I dont want to see this message.

Thanks, Matilde

Answer 1

[Sebastian Castro]

I would check a few things to narrow down the problem.

First off, do you have access to the ScopeData variable inside that callback function? I'm not 100% sure of this, but that data gets generated in the MATLAB base workspace and may not be accessible inside function workspace. I would, of course, check this on your end.

If you can access that variable, do the commands ScopeData.time and ScopeData.signals(1,2).values(:,1) execute without errors? Is there a syntax error, or does MATLAB simply not like all that indexing in one line?

I'd recommend putting a breakpoint in that callback function and testing things out incrementally to see what's up.

- Sebastian

[Matilde P.M. Pato]

Hello Sebastian

Thanks for your answer. In fact I can acess the data from ScopeData, and for this I have a figure with the results. However, I do not understand the reason for MatLab display the error message.

I' ve done the breakpoint.

Matilde